YOU SAID:

I was unsure of how my mom got pregnant

INTO JAPANESE

私は私の母がどのように妊娠したのかわからなかった

BACK INTO ENGLISH

I did not know how my mother got pregnant

INTO JAPANESE

私は私の母がどのように妊娠したのか知りませんでした

BACK INTO ENGLISH

I did not know how my mother got pregnant